CONTENTS

The
id
utility displays the user and group names and numeric IDs, of the
calling process, to the standard output.
If the real and effective IDs are different, both are displayed,
otherwise only the real ID is displayed.

If a
user
(login name or user ID)
is specified, the user and group IDs of that user are displayed.
In this case, the real and effective IDs are assumed to be the same.

Display the different group IDs (effective, real and supplementary)
as white-space separated numbers, in no particular order.

-M

Display the MAC label of the current process.

-P

Display the id as a password file entry.

-a

Ignored for compatibility with other
id
implementations.

-c

Display current login class.

-g

Display the effective group ID as a number.

-n

Display the name of the user or group ID for the
-G ,
-g
and
-u
options instead of the number.
If any of the ID numbers cannot be mapped into names, the number will be
displayed as usual.

-p

Make the output human-readable.
If the user name returned by
getlogin(2)
is different from the login name referenced by the user ID, the name
returned by
getlogin(2)
is displayed, preceded by the keyword
"login".
The user ID as a name is displayed, preceded by the keyword
"uid".
If the effective user ID is different from the real user ID, the real user
ID is displayed as a name, preceded by the keyword
"euid".
If the effective group ID is different from the real group ID, the real group
ID is displayed as a name, preceded by the keyword
"rgid".
The list of groups to which the user belongs is then displayed as names,
preceded by the keyword
"groups".
Each display is on a separate line.

-r

Display the real ID for the
-g
and
-u
options instead of the effective ID.